scholarly journals Fundamental Study on Production Method of Concrete by Post-Addition of Silica Fume Slurry to Concrete in Truck Agitator

2022 ◽  
Vol 33 (0) ◽  
pp. 15-21
Author(s):  
Takeshi Igai ◽  
Tatsuhiko Saeki ◽  
Tsuyoshi Saito ◽  
Kazuo Ikeura
Keyword(s):  
Silica Fume ◽  
Production Method ◽  
Fundamental Study

scholarly journals FUNDAMENTAL STUDY ON PRODUCTION METHOD OF CONCRETE BY ADDITION OF SILICA FUME SLURRY TO TRUCK AGITATOR

2020 ◽  
Vol 73 (1) ◽  
pp. 459-464
Author(s):  
Takeshi IGAI ◽  
Tatsuhiko SAEKI ◽  
Tsuyoshi SAITO ◽  
RIDHWAN ANAS
Keyword(s):  
Silica Fume ◽  
Production Method ◽  
Fundamental Study

scholarly journals FUNDAMENTAL STUDY ON CHLORIDE ION DIFFUSION AND STEEL CORROSION IN SILICA FUME CONCRETE

2011 ◽  
Vol 65 (1) ◽  
pp. 360-367
Author(s):  
Shinichi KAWAHARA ◽  
Tatsuhiko SAEKI ◽  
Tsuyoshi SHIMA ◽  
Hironori YOSHIZAWA
Keyword(s):  
Silica Fume ◽  
Steel Corrosion ◽  
Chloride Ion ◽  
Ion Diffusion ◽  
Fundamental Study ◽  
Chloride Ion Diffusion

scholarly journals Fundamental Study on Low-Temperature Autoclaving Focused on the Water Cement Ratio and Silica Fume Content

2013 ◽  
Vol 62 (10) ◽  
pp. 615-620 ◽  
Author(s):  
Shin YAMAGUCHI ◽  
Masami UZAWA ◽  
Naofumi IWASAKI ◽  
Yoji OGAWA ◽  
Yoshinari ITOH ◽  
...  
Keyword(s):  
Low Temperature ◽  
Silica Fume ◽  
Fundamental Study ◽  
Cement Ratio ◽  
Water Cement Ratio

Studies of copper selenide ultrafine particles by newly developed gas evaporation method

1990 ◽  
Vol 48 (4) ◽  
pp. 306-307
Author(s):  
Chihiro Kaito ◽  
Yoshio Saito
Keyword(s):  
Crystal Structure ◽  
Ultrafine Particles ◽  
Fine Particles ◽  
Production Method ◽  
Atmospheric Temperature ◽  
Copper Selenide ◽  
Quartz Boat ◽  
Selenium Vapor ◽  
Ar Gas ◽  
Ultra Fine Particles

The direct evaporation of metallic oxides or sulfides does not always given the same compounds with starting material, i.e. decomposition took place. Since the controll of the sulfur or selenium vapors was difficult, a similar production method for oxide particles could not be used for preparation of such compounds in spite of increasing interest in the fields of material science, astrophysics and mineralogy. In the present paper, copper metal was evaporated from a molybdenum silicide heater which was proposed by us to produce the ultra-fine particles in reactive gas as shown schematically in Figure 1. Typical smoke by this method in Ar gas at a pressure of 13 kPa is shown in Figure 2. Since the temperature at a location of a few mm below the heater, maintained at 1400° C , were a few hundred degrees centigrade, the selenium powder in a quartz boat was evaporated at atmospheric temperature just below the heater. The copper vapor that evaporated from the heater was mixed with the stream of selenium vapor,and selenide was formed near the boat. If then condensed by rapid cooling due to the collision with inert gas, thus forming smoke similar to that from the metallic sulfide formation. Particles were collected and studied by a Hitachi H-800 electron microscope.Figure 3 shows typical EM images of the produced copper selenide particles. The morphology was different by the crystal structure, i.e. round shaped plate (CuSe;hexagona1 a=0.39,C=l.723 nm) ,definite shaped p1 ate(Cu5Se4;Orthorhombic;a=0.8227 , b=1.1982 , c=0.641 nm) and a tetrahedron(Cu1.8Se; cubic a=0.5739 nm). In the case of compound ultrafine particles there have been no observation for the particles of the tetrahedron shape. Since the crystal structure of Cu1.8Se is the anti-f1uorite structure, there has no polarity.

Fundamental Study on Application of the Nanocomposite to an Electrical Rotating Machine

2017 ◽  
Vol 137 (11) ◽  
pp. 645-651
Author(s):  
Kotaro Mura ◽  
Toshihiro Tsuda ◽  
Tetsuo Yoshimitsu ◽  
Takuya Onishi ◽  
Shuichiro Hashimoto ◽  
...  
Keyword(s):  
Fundamental Study ◽  
Rotating Machine
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